#ifndef __LUA_PBC_EXTRA_H_#define __LUA_PBC_EXTRA_H_#if defined(_USRDLL)#define LUA_EXTENSIONS_DLL     __declspec(dllexport)#else         /* use a DLL library */#define LUA_EXTENSIONS_DLL#endif#if __cplusplusextern "C" {#endif    #include "lauxlib.h"        int LUA_EXTENSIONS_DLL luaopen_protobuf_c(lua_State *L);    #if __cplusplus}#endif#endif